A Magic Formula is a secondary quest in Act V of The Witcher and the neutral path’s piece of the Raven’s armor puzzle. If Geralt has stayed out of the war between the Order and the Scoia’tael, Kalkstein in Old Vizima offers to reforge the legendary armor of the witcher Raven, provided Geralt brings him the parts: pieces of Raven’s armor, the armor of a knight of the de Ruyter line, the notes of an elven minstrel and the magic formula of the sorceress Agnes of Glanville.
All of it is out in the swamp cemetery. The formula is the tricky part, since it sits in Agnes’s sealed underground laboratory. Kalkstein knows the trick: a magic-sensitive stone near the cave where the refugees are hiding opens the way when you cast Aard, Igni and Aard in that order. Bring everything back and Kalkstein turns the scraps into the standard version of Raven’s armor.
